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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8cac7466e4facc0f19e7ae1d9c13fa1e3b65b8cbf52fb3e4b09846605ea1709a' 
  AND token = '5fuY3HR/T5xZrEidXCF9xUw/yGCvQ8jfkgY8ZAmvaeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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