SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4199c7b8c45dc05be091b0221ffe05771d118d8b6e438ff73ea8e9faf6a96b4' 
  AND token = 'Cd9uYJRiSNN4Evsrmc6pfIBp4Cw5IsG+rg3yBKUV2xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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