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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4d0293dec22185c117d61497399b01dee1acb4783818c04b8ca35effda54cb2' 
  AND token = 'DunUDQX/4+oPaU4YNrrqIjEkUa1jfSJkBEw09VM/t9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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