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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46ce111726838b6660937400554e43e4e09a65a1aa5a55b9c00057738611064b' 
  AND token = 'QD/kWwZc7fKO3Sfk60jA1a7wLGOltd17oFsQ2LHHmpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}