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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09d77b98b44b08179d5370b0a6c9a1015feaa497a9e02add14b1b42f938f2bad' 
  AND token = '0u2jHQLcC3vGa/MIIkvcy35WpT1l3/FpguV9Up4MJaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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