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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7bce99d8ab06d845c1a25a0decb9a446b127415b6b9a3e65f8edbda8d9f0cc3' 
  AND token = '9T7pwqQ+kB2Ux9F29FeKtp6tRRLs6wudOFVzGrCkqWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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