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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c790e5dbb3d85775e2dbbe1bd8a85c140af382d4dfe0b9b91686d40e1020cd45' 
  AND token = 'bwQxyg4+4Y4vWoYgY2hEX/og5fwrBwyYJRtWDrq8W0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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