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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc7f35100a61d34772a1cc9adfe0173509dc3a43ab2a4f83fb027179d029fd8f' 
  AND token = 'TdrN3/6YHC1Hc3L1l7J4yatiREcxiQ7vnD3IVerfTMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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