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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ff4ecb6f6234473c6219bdeeca50de06e117a8a10099a1a08d99f09463b655d' 
  AND token = 'xvo44ApVBX9cxdwJLzmlz9naeXI4Ihoq2ee7vciaUPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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