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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d04020d385a58ab4414da6c0934d401bcfff014e14526491617a7af1824d1cc' 
  AND token = 'e74SyU9t1Q+iWBfqUyza8V4wbFEE9B39xpWWTA75ngo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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