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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3beef6de9b78ac7b26b30074db309245f062741b2a69bfa9f4e059ccb28fa6f2' 
  AND token = 'pXWXAfhP4aYCeqmMjmWZjJtXvolv6N0wdn2Mxbcmeig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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