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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63d5c8117d97729e5b057125160dfde9912d4d55b9933e632d8b2a2486a39530' 
  AND token = 'P3aOUzbwU5vD4lkD0mLSlKFUPOxCQN70AeGc4QvYQOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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