SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30b52897a2642ad47ebdd81dab8e2e5c846f6fe059daa0c267d18fa587d1080b' 
  AND token = 'r/rvXxSqRj1ntl8v3oGnODGzI7CBkCLFpxwJmKd9xlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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