SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '173a52de364f9bdade67b42c7a8d035f1f9394b58a8948af8c27b355854a0db7' 
  AND token = 'YmNDMoy6U9FPE4AoPBZ+sMCzNFTnoqWrlFlsX3glL+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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