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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ff78dfd74c70f8ddd6868379a7de6d28e7ac73cf238ddc0e0e3e04762935561' 
  AND token = '2Zzy65xx+ySUYajTso5X5eBGYF1ndRp7Fg9D38Tjr+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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