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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dcba5423e26699de32fdbaa11060e5379eae131e80e707ec3ca6d52f3c922f7c' 
  AND token = '7DSRwKG3MUP0UEw5U+GGMENEI59//IXtE/tYA4vYs5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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