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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd29f0d3d7f131fcabb69da81d594f42bfc256190b87c4724129ddb48d202e84b' 
  AND token = '4diKHjFRqTWaPd2/Q60sOeJdYfIM0AdhscXFYw9Lx5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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