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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b69f1be38f0ae9f7ab9e09050ae6690c20aa93cea53ea68e6d1e275eb374cf1e' 
  AND token = 'XmbK/7+L16lzXVgsREjWgOxxGrDbAMIYuAM2sNLiNn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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