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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c11b9b6899b5d5f9e95c323c2ee161001ef00efd52bfc6c7ce8bf4d6dec943c7' 
  AND token = 'VWuAhFKaS+dtdfE6LZYyi0EWr0QexvVTa381MGR8uJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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