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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c5e61fe1df0df95bbc19f5dddc25addb614bebebdb2dc0582276663ca5a4cfd' 
  AND token = 'NUOvl4gVZt2mlaxZI2uhXrHWmNJ59/YlTe2M+2W44F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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