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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5adb4908c70c868005a8b3874fe68922aaf30fa51ea30c29a8c9a9de09f5bcf7' 
  AND token = 'YFYsdEinaeJQtyqRZkRmsahsGKdTGPP5iFt/IZdsV1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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