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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5155e3b9930653d18ea0148d492ab26c03ff954aee76c2332edff4763ed10ea4' 
  AND token = '/LcWsROypQb0EUjdSad3c0e94fEvHyiYnIzk1js1ms0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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