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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3f23c19d83c2707d8fc74013f6c9e3c8ead8a21e9047b3799cc3ce2ec85d85d' 
  AND token = 'W1+15rLe4hq68YrPKOsbluRE/YVquRz/+XuwbPWepSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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