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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '74d4d2c8ab228ca6a6830553c705d4d456cbee5a34d7ffee6304050919fa66fd' 
  AND token = '9GIjBJeOINtiG7kBwmidaBIq/9XQbc5c6DJHbnzoG5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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