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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2bc5cc01e9e937054d50b998e0d85c9171865f9d671604402fb14a57637ae5df' 
  AND token = 'kt8Ks5zXGkeFz937Q6OZI7UBndxUxSpalRBwgY3vpak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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