SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b91607e3fe654cd6af34719727269854d596cf0329fe38b6d49b132b93d9996' 
  AND token = 's75jQ1DZ5teZWbV5R+r4kDmwhqWry5FQSz0fA56gZJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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