SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3597ab237c3cb4792f8b5939512ed3ee54da4a19df4d50335c55aa8f685ae3f' 
  AND token = 'gO7C8YwWq+nz6LmK7zMn+w5TCYovzHLLMtuNN/1SonA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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