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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '383a7d89d272569943d8bcb93c411fb0467875beee530fb57d70f2e8c47dae7e' 
  AND token = 'kTGHRfu4FbAuRptsghYQ2Ui+475L687yQLCZdAD3jzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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