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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33e5e8b1124af252c8d1429ca366451532693fb21fbb74e2e5d6025463b47042' 
  AND token = 'ZO4ZOxqd8XcgnLgD5RAyT2ZCDs6x4cgWfnKPWNSxeUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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