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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4fa61cff891068e560c49db5bc4784d03b3ea4a18a6a85a8cfdba1f93acdef1b' 
  AND token = '95ZV7C5/F+vkbPjpn/5X0fI3y1QyU1PK3TnoEu+MtOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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