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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc83ae3b597fafccb8f20c1b7f4eba9132b625ed8301ac8bfb7802e994980976' 
  AND token = 'mzLdVd9pLIJbB3gZNGdQhDR5Py98oKQYIrxzOdneQEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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