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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6b3850320f97d42cbd97499c2fb1db73480924c7a78d35fde15f48bd84dcc8b' 
  AND token = 'EGjc9NLuq1UVi0ES7GF7LOlfpbl5YbKGxi0SlbgbNjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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