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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ede32717f13ea15827cdb5f32bd73f5c91d9c9d9d7b9ab5031660bb4c96d3711' 
  AND token = '+jG9ubT3W7jJj/Xgwa9IGW6NDtcu+Yk8pWrCz7mO7jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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