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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3be0da5a26fc4ebc3c8eb24d5094cc3b9a249c37402797df2793b1ededdc6ebc' 
  AND token = 'YX5SjzV5XQKx5Tg5N00ZHUbGSidRR/rKXhUb9Xltofo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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