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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ab4d712630de5bb48b39cee00198567e936e389c488d020572b88dae5495cd3' 
  AND token = 'TM+9T0AxkA+/rXkh30LqzADlyUCxYwuZGxJyjioUbHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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