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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31e051bcec1158fb30dcbe0f94d59a4f77e571855bff24526437cbb1774c74ed' 
  AND token = '+oZz1K1E9h62jB8WMsWqyEm90wDnfhixsTE5t0qfohI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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