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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '329855ca182804bda47b9037518ca0d07c472b6a8d42fa46f1f96fadc91de207' 
  AND token = 'IoxLTODzQ3zk7+kzB7JwfiGfK2Eix0AdSLUCgS3NpD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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