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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a9efd37f9810322b25e248244bb3acb7566c0fa146017e175d17cf588c781ed' 
  AND token = 'RjReLIwOwffq3N/NnNZp6YEaSWVesljFdytfkCl/pB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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