SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1914ddf02695b3a664d1145cf100ff5aa280d0042994492803f36913ecfdcc86' 
  AND token = 'QYJ5hJkWBIb+32z/7UYd/B0Hyx5NZ7vKLDIihjEjsvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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