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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '588d1d2289eab7d55596035f6219df896a5e87647d7ace13c0d24f7e35c0206b' 
  AND token = '5KXZHAV21Yo9VsB8uF3AIkxNS02vIZMmI1vSZFsiAH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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