SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9741782b5796c599d943088d3b36e733e0d3b9457a889af9568fec3860e9466' 
  AND token = 'sCeojGUjiwGG9B2paJZUw9SBVLCHtyXM3vjqR5kTAkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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