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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c630b1eda1b8046d3b5dbbc0783ac9704d0e48384d8ae69c9da851d0b76ea4f5' 
  AND token = 'qmwEHXmB/4K3heUWvgfh7mXZGcb1LdzJ5cqty9fAdss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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