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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf5b7161d3babf79473c9023de52635a98727a216f5a52ff1eb7ee190411b798' 
  AND token = 'J5M37tKEbYzvyFp5jHM2sDyJ9pUkkTXkaLyM6WM2hN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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