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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9cce22b247b20e602ab251424d5841571e54e07188db152497f8bcec32fece07' 
  AND token = 'C6C7l1o5kKEmtpt+gtyoZhgUMR01VkLS3bzF+yJ+gwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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