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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56058f63726ac1d32d348bb504c4c1e177570a6eebde8eed1ddc897b08dd7a83' 
  AND token = 'HfSzG8RZR7apo9b029V2eRflEyNLfpWJgHiF3mrHEEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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