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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93819c6f6ec8e8096106b33a8c65bfea6f983fb4ace637fcba0dc3876464c469' 
  AND token = 'uR58/OMYG+ww7/EzdvLepcXWvxlp0mAETlSXwzQh0nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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