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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b847c56a0c22b433be2e9db04fec0f7cff686964f9ab967af6cc1908bcd817fc' 
  AND token = '9qlemntlusP+rPVCykywVyboh5fFNGqryccWUZO0ysw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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