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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98a58142ef4851285758cba0d9827be3952a7683abf8cb2bb11ba2bcdc1946d2' 
  AND token = '9WeusK/pcwm1jYuAS843gqeeY/Zao4r8KVUzoj3lgQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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