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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4ff9e65f967e08ef0f8f0da145fd3a59fda0cb7f57302bd0f5f48fad53b5c5c' 
  AND token = 'bCAeK+tv5yd47o3EiDpm2eq9PsB7YHTBCt5SfFkPGh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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