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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f34ab34b7b77e1eacb4387624fbe36b83000396e14b36a3784ac2a5b8a01a26b' 
  AND token = 'hghTCthO+P7vqn37v55Pi4Jewb+4bhtA/hYieJ2RYUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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