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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '285403a843772e16f8fbac7f620c46cf65ca66e3b893706f2b24731e3682381e' 
  AND token = 'V1GfmUMq3kyWh2ZMwSO1f6ybj8cClx4Xr+ols0vSvHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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