SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f26940e844976e6949ec521b37c135495e11b11183a557ac60fee463475e238' 
  AND token = 'LBKMJuvZvz2HziFW6W20mqYwymXkIkfyhrVFg9lzFDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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