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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd236dd1e3e76a2d368e831f6f29367713209f96a530adbdfc41c18fc21e16447' 
  AND token = 'An8SOXRwBiz1XrRdUFgsyFXcTVYIhUWX9O/Hg/eTIaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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