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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52713077cee5db691b45c2ed71b4e31673686134b50d2a1d58612172ba55b28d' 
  AND token = '1KWa7jV0RHfwkz58KiKwvFr/B0d+e4LNidP7zgrYV0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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