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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cbf743e2e050c75797be1eb120511a5a1c25346c99d5a62e8fc7ab57659ea850' 
  AND token = 'V38Bg6YoOQ/5mWFnPYzbMH7X3fG9oRy30w4Y3s0nPHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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