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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35dd90b9695e677982bac3d97e5ec33c86295f317d0bb732b743d7723c91b907' 
  AND token = 'VtyRnpl9Yp3/kGemhBVSfDHcsoEh9fbLGmM7pz1osYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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