SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ca1355fa4e4db6b8ce612f6fed11f34ecdde7c0737ce9ad0816a4df28d81004' 
  AND token = '9XB5BjoH81VBEnyLWYiUAGlpM2DT4Tlh9vw/hkaDVJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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