SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '785d7ad23223c0923d4b30ecd0f215dc7acf0c7d856c445d10e8e977004840b1' 
  AND token = 'R+Z6mkiYrzwfULa/eeXCVrcqSulcAVADRtOkB9seKwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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