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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98919b117cfe5f7201ec9d8a3c3299199cf1fa3916c8254b764369f1f95239a7' 
  AND token = 'efxydwJPyYbOv79eHE188I3obQoaqQ5Obb+CS+/ssks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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