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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69027f841ca622e6da16f4fd568c2e667a56531a8c1e032ff0fd9573dd8bf9d0' 
  AND token = 'XvmQpejwWM/YeeYznGI0nRFzzPgyxy/ty/dDrf0sm3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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