SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba26993d7bb5d2de4ca93bdf1a87f6eea58f6c9bf60cdf51e5cf2213967931fb' 
  AND token = 'HqvR9moZMXhSQmN6kpohHznmXE6I+1mQvFqwGMayagM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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