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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17aedb8e8821b0afb7652e9b238f956573e51ba68ee3fd03672e9030a2348e48' 
  AND token = 'gPwErtYg7NIg/AnWWYyRlWBNL46PjXpEbjtpFiUP4qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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