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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31cf6d55e735f28150e64a2c9c43b8111c8aef49fc3d5b83eaf6907fc46a869f' 
  AND token = 'Nr5sE8e3sGUIUNbma1Ev4cTZEluaysym0rXpXR6M3mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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