SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b677d948b21c1f05efaa27f872c8b66c4d529a37fe7cdad54a9dc08d96095a01' 
  AND token = '6bBPhFZc3wGjJrmzC08wMFl8R7aV39dkbTqydrJItnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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